i have a 1983 GMC sierra classic. it has a gear vendor and the reverse is slipping?

[Ruu&&Let]

I have a Gmc Sierra classic pick up. Short bed with a turbo 400 tranny.
Also with a Gearvendor..(overdrive) installed on it. My reverse started to recenty slip. I Took it to a Shop and they told me the transmission was good, therefore the gear vendor is bad. Where can i get a used one? or a cheao one. Or can it even be rebuilt? Do i need a new unit? Or is it better just to put the transmission tail back on and take the gear vendor off? thanks!

 

[Molson02536]

The Gearvendor Overdrive has only one weakness - reverse. Basically, when the unit is disengaged there is an overrun clutch that's held under spring tension. Reverse input torque (and even engine braking when the O/D is not engaged) is held by the overrun clutch. The limit to that clutch's torque handling can be exceeded under certain circumstances. For example, if you had to back a boat with surge brake up an incline to park it you'd be asking for trouble.

Here is link for Gearvandor and see if they have a upgrade for the reverse overrun clutch or a rebuilt kit. Good luck and keep us all posted.
http://www.gearvendors.com/index.html